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[86.195.82.193]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488fc18bccfsm658230335e9.8.2026.04.26.07.43.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 26 Apr 2026 07:43:10 -0700 (PDT) From: Bernard Pidoux To: netdev@vger.kernel.org Cc: linux-hams@vger.kernel.org, linux-kernel@vger.kernel.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, Bernard Pidoux Subject: [PATCH net 5/5] rose: guard rose_neigh_put() against NULL in timer expiry Date: Sun, 26 Apr 2026 16:43:05 +0200 Message-ID: <20260426144305.984349-6-bernard.f6bvp@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260426144305.984349-1-bernard.f6bvp@gmail.com> References: <20260426144305.984349-1-bernard.f6bvp@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In rose_timer_expiry(), the ROSE_STATE_2 branch calls rose_neigh_put(rose->neighbour) without first checking whether the pointer is NULL. After commit 5de7665e0a07 ("net: rose: fix timer races against user threads") the timer is re-armed when the socket is owned by a user thread; between the re-arm and the next firing, a device-down event or concurrent teardown via rose_kill_by_device() can set rose->neighbour to NULL, leading to a NULL-pointer dereference inside rose_neigh_put(). Add a NULL check before the put and clear the pointer afterwards. Fixes: 5de7665e0a07 ("net: rose: fix timer races against user threads") Tested-by: Bernard Pidoux Signed-off-by: Bernard Pidoux --- net/rose/rose_timer.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/net/rose/rose_timer.c b/net/rose/rose_timer.c index bb60a1654d61..d997d24ab081 100644 --- a/net/rose/rose_timer.c +++ b/net/rose/rose_timer.c @@ -180,7 +180,10 @@ static void rose_timer_expiry(struct timer_list *t) break; case ROSE_STATE_2: /* T3 */ - rose_neigh_put(rose->neighbour); + if (rose->neighbour) { + rose_neigh_put(rose->neighbour); + rose->neighbour = NULL; + } rose_disconnect(sk, ETIMEDOUT, -1, -1); break; -- 2.51.0